11 asp.net azure azure-storage-blobs
在ASP.NET内部有一个2 GB的寻址空间,但实际上你只有不到1 GB的上传空间(参见http://support.microsoft.com/?id=295626).此外,IIS 7的上限为30 MB(请参阅http://www.iislogs.com/steveschofield/iis7-post-40-adjusting-file-upload-size-in-iis7),您可能必须运行
appcmd set config "My Site/MyApp" -section:requestFiltering -requestLimits.maxAllowedContentLength:104857600 -commitpath:apphost
在服务器上超过这个30 MB的限制.但是如何在Azure服务器上运行它？
另外,根据http://support.microsoft.com/?id=295626
在上载过程中,ASP.NET会在用户将文件保存到磁盘之前将整个文件加载到内存中.
,如果很多用户一次上传大文件,我会很快耗尽内存限制.在我的下面的代码中,我使用流,但我猜测整个文件无论如何都先在内存中上传.是这样的吗？
using System;
using System.Web.Security;
using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.StorageClient;
namespace WebPages
{
public partial class Upload : System.Web.UI.Page
{
CloudBlobClient BlobClient = null;
CloudBlobContainer BlobContainer = null;
void InitBlob()
{
// Setup the connection to Windows Azure Storage
var storageAccount = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");
BlobClient = storageAccount.CreateCloudBlobClient();
// Get and create the container
BlobContainer = BlobClient.GetContainerReference("publicfiles");
}
protected void Page_Load(object sender, EventArgs e)
{
//if (Membership.GetUser() == null) return; // Only allow registered users to upload files
InitBlob();
try
{
var file = Request.Files["Filedata"];
var storageAccount = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");
BlobClient = storageAccount.CreateCloudBlobClient();
// Make a unique blob name
var extension = System.IO.Path.GetExtension(file.FileName);
// Create the Blob and upload the file
var blobAddressUri = String.Format("{0}{1}", Guid.NewGuid(), extension);
var blob = BlobContainer.GetBlobReference(blobAddressUri);
blob.UploadFromStream(file.InputStream);
// Set the metadata into the blob
blob.Metadata["FileName"] = file.FileName;
//blob.Metadata["Submitter"] = Membership.GetUser().UserName;
blob.Metadata["Type"] = "Video";
blob.Metadata["Description"] = "Test";
blob.SetMetadata();
// Set the properties
blob.Properties.ContentType = file.ContentType;
blob.SetProperties();
}
catch(Exception ex)
{
System.Diagnostics.Trace.TraceError("Upload file exception: {0}", ex.ToString());
// If any kind of error occurs return a 500 Internal Server error
Response.StatusCode = 500;
Response.Write("An error occured while uploading the file");
Response.End();
}
}
}
}
我知道非网页上传工具,如http://azureblobuploader.codeplex.com/,但我真的需要它从网页上传.
所以,我的问题是:
我还可以提一下,我的代码默认情况下工作正常,文件小于30 MB,我在客户端使用SWFUpload V2.2.0.
更新19.六月19:09: Twitter上的@YvesGoeleven给了我一个使用共享访问签名(请参阅msdn.microsoft.com/en-us/library/ee395415.aspx)并将文件直接上传到Azure Blob存储的提示完全通过ASP.NET.我创建了一个JSON WCF,它向我的blob存储区返回一个有效的SAS ut.
using System.ServiceModel;
using System.ServiceModel.Web;
namespace WebPages.Interfaces
{
[ServiceContract]
public interface IUpload
{
[OperationContract]
[WebInvoke(Method = "GET",
ResponseFormat = WebMessageFormat.Json)]
string GetUploadUrl();
}
}
--------
using System;
using System.IO;
using System.Runtime.Serialization.Json;
using System.ServiceModel.Activation;
using System.Text;
using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.StorageClient;
namespace WebPages.Interfaces
{
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class UploadService : IUpload
{
CloudBlobClient BlobClient;
CloudBlobContainer BlobContainer;
public UploadService()
{
// Setup the connection to Windows Azure Storage
var storageAccount = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");
BlobClient = storageAccount.CreateCloudBlobClient();
// Get and create the container
BlobContainer = BlobClient.GetContainerReference("publicfiles");
}
string JsonSerialize(string url)
{
var serializer = new DataContractJsonSerializer(url.GetType());
var memoryStream = new MemoryStream();
serializer.WriteObject(memoryStream, url);
return Encoding.Default.GetString(memoryStream.ToArray());
}
public string GetUploadUrl()
{
var sasWithIdentifier = BlobContainer.GetSharedAccessSignature(new SharedAccessPolicy()
{
Permissions = SharedAccessPermissions.Write,
SharedAccessExpiryTime =
DateTime.UtcNow.AddMinutes(60)
});
return JsonSerialize(BlobContainer.Uri.AbsoluteUri + "/" + Guid.NewGuid() + sasWithIdentifier);
}
}
}
它可以工作,但我不能将它与SWFUpload一起使用,因为它使用HTTP POST动词而不是Azure Blob存储在创建新blob项时所期望的HTTP PUT动词.任何人都知道如何避免使用我自己的自定义Silverlight或Flash客户端组件使用HTTP PUT动词？上传文件时我想要一个进度条,因此使用PUT的提交表单不是最佳选择.
对于那些对客户端代码感兴趣的人(由于SWFUpload使用HTTP POST而不是PUT,因为Azure Blob存储需要)
<div id="header">
<h1 id="logo"><a href="/">SWFUpload</a></h1>
<div id="version">v2.2.0</div>
</div>
<div id="content">
<h2>Application Demo (ASP.Net 2.0)</h2>
<div id="swfu_container" style="margin: 0px 10px;">
<div>
<span id="spanButtonPlaceholder"></span>
</div>
<div id="divFileProgressContainer" style="height: 75px;"></div>
<div id="thumbnails"></div>
</div>
</div>
<script type="text/javascript" language="javascript">
$(document).ready(function () {
$.ajax({
url: '/Interfaces/UploadService.svc/GetUploadUrl',
success: function (result) {
var parsedResult = $.parseJSON(result);
InitUploadFile(parsedResult);
}
});
function InitUploadFile(uploadUrl) {
//alert(uploadUrl);
var swfu = new SWFUpload({
// Backend Settings
upload_url: uploadUrl,
post_params: {
"ASPSESSID": "<%=Session.SessionID %>"
},
// File Upload Settings
file_size_limit: "100 MB",
file_types: "*.*",
file_types_description: "All file types",
file_upload_limit: "0", // Zero means unlimited
// Event Handler Settings - these functions as defined in Handlers.js
// The handlers are not part of SWFUpload but are part of my website and control how
// my website reacts to the SWFUpload events.
file_queue_error_handler: fileQueueError,
file_dialog_complete_handler: fileDialogComplete,
upload_progress_handler: uploadProgress,
upload_error_handler: uploadError,
upload_success_handler: uploadSuccess,
upload_complete_handler: uploadComplete,
// Button settings
button_image_url: "Images/swfupload/XPButtonNoText_160x22.png",
button_placeholder_id: "spanButtonPlaceholder",
button_width: 160,
button_height: 22,
button_text: '<span class="button">Select files <span class="buttonSmall">(2 MB Max)</span></span>',
button_text_style: '.button { font-family: Helvetica, Arial, sans-serif; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',
button_text_top_padding: 1,
button_text_left_padding: 5,
// Flash Settings
flash_url: "Js/swfupload-2.2.0/swfupload.swf", // Relative to this file
custom_settings: {
upload_target: "divFileProgressContainer"
},
// Debug Settings
debug: false
});
}
});
</script>
更新19. 6月21日:07:
我想,因为SWFUpload是开源的,我下载源并将动词从POST更改为PUT,遗憾的是Flash Player URLRequestMethod不支持除GET和POST之外的其他动词.我找到了一个假设的解决方案
private function BuildRequest():URLRequest {
// Create the request object
var request:URLRequest = new URLRequest();
request.method = URLRequestMethod.POST;
request.requestHeaders.push(new URLRequestHeader("X-HTTP-Method-Override", "PUT"));
,但这仅适用于Adobe Air,而不适用于Flash Player.
我已经读过SilverLight 3及更高版本支持HTTP PUT动词,所以我想我必须编写一些SilverLight代码才能在这里找到答案.我确实找到了这个博客文章系列,可能会帮助我http://blog.smarx.com/posts/uploading-windows-azure-blobs-from-silverlight-part-1-shared-access-signatures.
2011年6月27日更新:
我现在已成功设法使用我在http://blog.smarx.com/posts/uploading-windows-中根据项目编写的自定义Silverlight客户端从网页上传大文件(使用4,5 Gb文件测试)azure-blobs-from-silverlight-part-1-shared-access-signature.由于Silverlight支持Azure Blob存储所需的HTTP PUT动词并支持渐进式上传,因此我现在可以将大量文件直接上传到Azure Blob存储,而且我也不必使用ASP.NET解决方案,我也是得到一些不错的进度条,如果他/她想要,用户可以在上传过程中取消.服务器上的内存使用量很小,因为整个文件在放入Azure Blob存储之前未上载.我使用共享访问签名(请参阅msdn.microsoft.com/en-us/library/ee395415.aspx),该签名是根据请求从WCF RESTfull服务提供的.我认为这个解决方案是我们找到的最好的解决方案.谢谢.
更新@ 18年7月11日:
我用我在这里找到的东西创建了一个开源项目:
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